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Synchrotron x-ray study of interstitial oxygen ordering in the superconducting phase of La2CuO4+δ

Published online by Cambridge University Press:  31 January 2011

X. Xiong ,
Q. Zhu ,
Z. G. Li ,
S. C. Moss ,
H. H. Feng ,
P. H. Hor ,
D.E. Cox ,
S. Bhavaraju  and
A. J. Jacobson
X. Xiong
Affiliation:
Texas Center for Superconductivity and Physics Department, University of Houston, Houston, Texas 77204
Q. Zhu
Affiliation:
Brookhaven National Laboratory, Upton, New York, 11973
Z. G. Li
Affiliation:
Texas Center for Superconductivity and Physics Department, University of Houston, Houston, Texas 77204
S. C. Moss
Affiliation:
Texas Center for Superconductivity and Physics Department, University of Houston, Houston, Texas 77204
H. H. Feng
Affiliation:
Texas Center for Superconductivity and Physics Department, University of Houston, Houston, Texas 77204
P. H. Hor
Affiliation:
Texas Center for Superconductivity and Physics Department, University of Houston, Houston, Texas 77204
D.E. Cox
Affiliation:
Brookhaven National Laboratory, Upton, New York 11973
S. Bhavaraju
Affiliation:
Texas Center for Superconductivity and Chemistry Department, University of Houston, Houston, Texas 77204
A. J. Jacobson
Affiliation:
Texas Center for Superconductivity and Chemistry Department, University of Houston, Houston, Texas 77204
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Abstract

A synchrotron x-ray powder-diffraction study has been carried out on two samples with well-defined excess oxygen concentrations, δ = 0.045 and 0.055. Evidence for one-dimensional interstitial oxygen ordering along the c -axis was observed from the appearance of a pair of superlattice satellite peaks at (0, 1,2 ± Δ) in both samples. In La2CuO4.045, a ∼5% oxygen-poor Bmab phase coexists with a stage-6 phase and with a small amount of the high-temperature-tetragonal (HTT) phase below the phase separation temperature (∼280 K). La2CuO4.055 shows a single stage-5 phase below 170 K, but with two unindexed peaks between (0, 1, 2 ± 0.2) satellites which may well result from a further domain modulation. The critical temperature Tc is increased by 1.5 K by reducing the stage number from 6 to 5.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 9 , September 1996 , pp. 2121 - 2124
Copyright
Copyright © Materials Research Society 1996

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References

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